fix: return correct id for article creation response

[RaphAlemoh]

Description

This pull request implements fix for the response to remove the null value in the article id after creation by an authenticated and authorised user. This endpoint uses the post method and ensures the user fill in the required fields.
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Related Issue (Link to Github issue)

Feature #867
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Endpoints
POST /api/v1/help-center/topics

Enable updating creation of help-center topics

How Has This Been Tested?

• Successful response with valid article id
• invalid request body
• Appropriate status code

Screenshots (if appropriate - Postman, etc):

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Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
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Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• [] I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.